Mitt Romney reportedly will meet with billionaire casino mogul and Dorchester native Sheldon Adelson Tuesday in Las Vegas, potentially allying himself with the most generous donor of the presidential campaign.

Adelson and his wife, Miriam, have already contributed $25.3 million to conservative candidates and committees but have not given any money to Romney. Most of their donations—a total of $20 million—have been directed at Winning Our Future, the super PAC that promoted Newt Gingrich’s presidential candidacy.

But Adelson memorably declared Gingrich to be “at the end of his line” in late March; with the former House speaker officially out of the race and with Romney expected to clinch the Republican nomination in Tuesday’s Texas primary, Adelson’s get-together with Romney could signal a new partnership.

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The meeting was first reported by CBS News. Adelson has reportedly met with Romney at least once before, in February, assuring the former Massachusetts governor “that he will be behind him 100 percent should he become the nominee,” according to CNN.

Romney’s trip to Las Vegas also will include a fund-raiser with Donald Trump, the celebrity businessman who is a prominent “birther.” Trump has consistently questioned whether President Obama was born in the US, most recently last week, when on Twitter he wondered if Obama “ever applied to Occidental, Columbia or Harvard as a foreign student.”

The Obama campaign has urged Romney to disassociate himself from Trump. A new Web video contrasts Romney’s embrace of Trump with John McCain’s rejection of backers who in 2008 called Obama “an Arab.”

“I don’t agree with all the people who support me and my guess is they don’t all agree with everything I believe in,” Romney said Monday. “But I need to get 50.1 percent or more, and I’m appreciative to have the help of a lot of good people.”

Callum Borchers can be reached at callum.borchers@globe.com. Follow him on Twitter @callumborchers.